Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear Taka Inoue,
Good day!!
I understand your concern and to my knowledge, I would like to convey that Office 365 subscription includes the Power Automate for Office 365 but not Power Automate Premium, where even having or assigned with Office 365 E5 license, the Power Automate Premium will not be included and we need to purchase it separately.
For references:
Types of Power Automate licenses - Power Platform | Microsoft Learn
Licensing overview for Microsoft Power Platform - Power Platform | Microsoft Learn
Moreover, if you have any further concerns related to Power Automate, I would like to suggest you post your concern in the Microsoft Power Automate Community - Power Platform Community to get the detailed information from the experts.
Apologies for redirecting you to different community as the members in the category posted focus on the users with the Microsoft 365 concern and have limited knowledge on the Power Automate, so to get the fast and better assistance, we have redirected you in the correct path.
Appreciate your patience and understanding. Have a great day!!
Best Regards,
Sophia